JP2806101B2 - Ignition device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine having a function of periodically stopping an ignition operation when the rotation speed of the engine exceeds a set value in order to prevent the rotation speed of the internal combustion engine from becoming excessive. The present invention relates to an ignition device for a vehicle.

[0002]

2. Description of the Related Art A vehicle or the like driven by an internal combustion engine must prevent an excessive speed from occurring for safety reasons. Therefore, when the vehicle speed or the engine speed exceeds a predetermined value, the ignition operation of the engine is started. In some cases, an ignition device that is stopped is used. A conventional ignition device of this type converts an output from a vehicle speed detecting means into a voltage proportional to the vehicle speed and compares the output voltage with a predetermined reference voltage as disclosed in Japanese Patent Application Laid-Open No. Sho 59-168273. When the voltage proportional to the vehicle speed exceeds the reference voltage, the output of the ignition power generation coil is bypassed from the ignition circuit to stop the ignition operation at each ignition timing, thereby reducing the rotation speed of the engine to a set value or less. I was trying to return.

[0003]

SUMMARY OF THE INVENTION In a conventional ignition device,
When the rotation speed of the internal combustion engine exceeds a set value, the engine is misfired and the output of the engine is lost. When the rotation speed decreases and falls below the set value, the ignition of the engine is restarted and the engine rapidly outputs again. Therefore, the output of the engine fluctuates significantly before and after the set rotation speed, and especially when there is hysteresis between the rotation speed at which the ignition operation stops and the rotation speed at which the engine restarts, the engine output is suddenly fluctuated and the There is a possibility that an impact may occur on the mounted vehicle or the like, causing discomfort to the driver.

An object of the present invention is to charge an ignition energy storage capacitor with the output of one half cycle of an exciter coil provided in an AC generator driven by an internal combustion engine, and to charge the charge of the capacitor to the ignition timing of the engine. A capacitor discharge ignition circuit, which discharges the primary coil of the ignition coil through a discharge control thyristor that conducts to the ignition coil, prevents charging of the ignition energy storage capacitor when the rotation speed of the internal combustion engine exceeds a set value. In an ignition device for an internal combustion engine provided with a misfire control circuit for stopping an ignition operation, when the rotation speed of the engine exceeds a set value, the ignition operation is intermittently stopped and the engine is thinned and ignited. An object of the present invention is to provide an ignition device for an internal combustion engine in which the output of the engine is prevented from rapidly changing before and after.

[0005]

In order to achieve the above object, according to the present invention, a capacitor discharge ignition circuit is provided with a misfire control circuit, and a power supply capacitor for storing a part of the output of an exciter coil and the power supply capacitor. A power supply circuit having a constant voltage circuit for keeping the terminal voltage of the capacitor constant and obtaining a DC voltage across the power supply capacitor; and a state driven by the DC voltage obtained from the power supply circuit to take a first level. There is further provided a thinning-out control pulse generating circuit for generating a rectangular wave-like thinning-out control pulse which alternately repeats the state of taking the second level at a constant cycle. The misfire control circuit includes a misfire control thyristor that is connected to a charging circuit for the ignition energy storage capacitor and that substantially bypasses the charging current of the ignition energy storage capacitor from the capacitor when the capacitor is turned on. A thyristor ignition circuit for providing an ignition signal to the misfire control thyristor with the output of one half cycle, a speed detection capacitor charged with a constant time constant by the output of the other half cycle of the exciter coil, and this speed detection Is connected to the discharge circuit that discharges the charge of the capacitor for fixed time constant and the ignition circuit of the misfire control thyristor, and is controlled by the speed detection voltage obtained at both ends of the speed detection capacitor, and the speed detection voltage is set The ignition signal is prevented from being applied to the misfire control thyristor when the value is below the value, and the speed detection voltage A thyristor firing control switch to allow the firing signal is applied to the misfire control thyristor when was example, is connected to the ignition circuit of the misfire control thyristor,
Controlled by the thinning control pulse, the firing signal is prevented from being supplied to the misfire control thyristor during the period in which the thinning control pulse is at the first level, and the thinning control pulse becomes the second level. And a thinning-out control switch for allowing the firing signal to be supplied to the misfire control thyristor during the period.

In the above configuration, the charging of the power supply capacitor can be performed by the same power supply as the charging power supply of the ignition energy storage capacitor. In this case, the power supply capacitor is connected in series to the ignition energy storage capacitor, and the constant voltage circuit is provided with a charge control provided so that the charge current of the power supply capacitor is bypassed from the power supply capacitor when the power supply capacitor is turned on. And a circuit for triggering the charge control thyristor when the voltage across the power supply capacitor exceeds a set value. In this case, the power supply capacitor and the charge control thyristor form a part of the capacitor charging circuit.

Further, in order to obtain a misfire pattern which gives optimum driving feeling and vehicle speed stabilization at each throttle opening of the internal combustion engine, means for changing the duty of the thinning control pulse in accordance with the throttle opening of the internal combustion engine is provided. It can be provided in the thinning control pulse generation circuit.

[0008]

In the above arrangement, the speed detecting capacitor is charged with a constant time constant by the output of the other half cycle of the exciter coil and then discharged with a constant time constant through the discharging circuit. When the speed detection voltage obtained at both ends of the speed detection capacitor exceeds the set value, the thyristor firing control switch enters a state in which the firing signal is supplied to the misfire control thyristor. The period during which the speed detection voltage exceeds the set value increases as the engine speed increases, and when the engine speed exceeds the set speed, the condition where the speed detection voltage exceeds the set value causes the exciter coil to fail. The output of one half cycle will continue until the firing signal of the misfire control thyristor is generated. In this state, a firing signal is given to the misfire control thyristor every time the output of one half cycle of the exciter coil is generated, and the charging current of the ignition energy storage capacitor is bypassed by conduction of the thyristor. Become. However, in the present invention, a thinning control pulse generating circuit and a thinning control switch controlled by a thinning control pulse generated from the pulse generating circuit are further provided, and the thinning control pulse is supplied to the first level. During the period in which the pulse is at a second level, the thinning control switch prevents the ignition signal from being applied to the misfire control thyristor. Is given a firing signal. Since the thinning control pulse alternately repeats a state of taking the first level and a state of taking the second level at a constant cycle, when the internal combustion engine exceeds the set rotational speed, the misfire control thyristor is fired. A state in which the signal is prevented from being applied and the ignition operation is performed, and a state in which the misfire control thyristor is turned on and the ignition operation is stopped are alternately repeated at a constant cycle.

As described above, according to the present invention, when the internal combustion engine exceeds the set rotation speed, the ignition of the engine is intermittently stopped, so that the rotation speed of the engine can be limited to a set value or less. In addition, it is possible to prevent the output of the engine from fluctuating largely before and after the set rotational speed.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 schematically shows an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an ignition coil having a primary coil 1a and a secondary coil 1b, one end of which is grounded. The output of the secondary coil 1b of the ignition coil is applied to the ignition plug attached to the cylinder of the engine. Numeral 3 indicates that the primary current of the ignition coil 1 is suddenly changed at the ignition timing of the internal combustion engine so that the secondary coil 1
b is a main ignition circuit for inducing a high voltage in the ignition capacitor B. In this example, a capacitor C1 for storing ignition energy and a diode D1
And a discharge control thyristor S1 for discharging the electric charge of the capacitor C1 to the primary coil 1a of the ignition coil when conducting.
And an ignition timing determination circuit 4 for giving a trigger signal to the discharge control thyristor S1 at the ignition timing of the internal combustion engine. A diode D2 is inserted between the capacitor C1 and the primary coil 1a of the ignition coil to prevent the charging current of the capacitor C1 from flowing to the ignition coil. A flywheel diode D3 is connected in parallel to both ends of the primary coil 1a of the ignition coil. An exciter coil 5 is provided in an AC generator driven by the internal combustion engine, and generates an AC voltage in synchronization with rotation of the engine.

Reference numeral 6 denotes a power supply circuit, which comprises a power supply capacitor C2, a charge control thyristor S2, a Zener diode Z1, a diode D4, a resistor R1, and a capacitor C3. The power supply capacitor C2 is
The output of one half cycle of the exciter coil 5 in the direction of the solid line shown in the figure is charged to the polarity shown through the diode D1, the ignition energy storage capacitor C1 and the diode D4. In this example, the Zener diode Z1
The charge control thyristor S2 forms a constant voltage circuit for controlling the voltage across the power supply capacitor C2 to a constant value. When the voltage across the power supply capacitor C2 exceeds a certain value, the charge control thyristor S2 is triggered through the Zener diode Z1, and the thyristor S2 conducts. When the thyristor S2 conducts, the capacitor C2
Of the capacitor C2 through the thyristor S2.
Bypassed from. This controls the voltage across capacitor C2 to a constant value.

In this example, the diode D4 of the power supply circuit 6
The power supply capacitor C2 and the charge control thyristor S2 also serve as part of a capacitor charging circuit for charging the ignition energy storage capacitor C1 of the ignition main circuit. That is, when the thyristor S2 is in the cut-off state, the circuit of the exciter coil 5, the diode D1, the capacitor C1, the diode D4, the capacitor C2, and the exciter coil 5 forms a charging circuit for the capacitor C1. After the thyristor S2 is turned on, the circuit of the exciter coil 5, the diode D1, the capacitor C1, the thyristor S2, and the exciter coil 5 forms a charging circuit for the capacitor C1.

The ignition timing determination circuit 4 is a known circuit comprising a thyristor S3, a diode D5, a Zener diode Z2, a capacitor C4, and resistors R2 to R5, as shown in FIG. Diode D5
Is connected to the non-ground side terminal of the exciter coil 5, and a resistor R3 is connected in parallel between the gate and cathode of the discharge control thyristor S1. In this ignition timing determination circuit, when the output of the other half cycle in the direction of the dashed arrow shown in the drawing occurs in the exciter coil 5, the capacitor in the path of the exciter coil 5, the resistor R3, the capacitor C4, the resistor R4, the diode D5, and the exciter coil 5 C4 is charged to the polarity shown. When the voltage across capacitor C4 reaches a certain value, zener diode Z2 conducts, causing thyristor S3 to conduct, causing the charge on capacitor C4 to discharge through resistor R3, thyristor S3, and resistor R4. At this time, the voltage generated at both ends of the resistor R3 serves as a trigger signal to turn on the discharge control thyristor S1. When the thyristor S3 conducts, the output of the exciter coil 5 in the direction indicated by the broken line is short-circuited through the thyristor S3 and the diode D5. In this embodiment, a capacitor discharge ignition circuit is constituted by an ignition coil 1, an ignition main circuit 3, an exciter coil 5, a power supply circuit 6 which also serves as a part of a charging circuit for an ignition energy storage capacitor C1, and diodes D2 and D3. Have been.

In this ignition circuit, after the ignition energy storage capacitor C1 is charged to the polarity shown in the figure by the output of one half cycle of the exciter coil 5 (in the direction of the solid line in the figure), the other end of the exciter coil 5 (the broken line in the figure). The ignition timing determination circuit 4 is based on the output of a half cycle (in the direction of the arrow).
Control signal thyristor S1
Is turned on, the electric charge of the capacitor C1 becomes 1
The secondary coil 1a is discharged, and a high voltage for ignition is induced in the secondary coil 1b. Since this high voltage is applied to the spark plug 2, a spark is generated in the spark plug, and the engine is ignited.

In FIG. 1, reference numeral 7 denotes an ignition energy storage capacitor C when the rotational speed of the internal combustion engine exceeds a set value.
This is a misfire control circuit that stops charging and stops the ignition operation. Reference numeral 8 denotes a thinning-out control which is driven by a DC voltage obtained from the power supply circuit 6 and generates a rectangular thinning-out pulse in which a state of taking a first level and a state of taking a second level are alternately repeated at a constant cycle. As described later, the operation of the misfire control circuit is stopped and the ignition operation is restored during a period in which the thinning pulse obtained from the pulse generation circuit is at the first level.

FIG. 3 shows a specific configuration example of the misfire control circuit 7 and the thinning control pulse generation circuit 8 of the present embodiment.

The misfire control circuit 7 shown in FIG. 3 includes a diode D1 of a charging circuit for the ignition energy storage capacitor C1.
A thyristor firing circuit 9, a thyristor firing circuit 9, and a thyristor firing circuit provided to bypass the charging current of the ignition energy storage capacitor C1 when the anode is connected to the cathode of the capacitor through a resistor R6 to conduct electricity. A control switch 10, a discharge circuit 11, and a thinning control switch 12 are provided. The thyristor firing circuit 9
It consists of a diode D6, a resistor R7, a Zener diode Z3 and a resistor R8, and gives an ignition signal Vt to the misfire control thyristor S4 by the output of one half cycle of the exciter coil 5 in the direction of the solid line in the figure. The thyristor firing control switch 10 is provided with a resistor R of the thyristor firing circuit 9.
A transistor T1 having an emitter-collector circuit connected between the connection point of the transistor 7 and the Zener diode Z3 and ground; and a field-effect transistor F1 having a drain-source circuit connected in parallel between the base and collector of the transistor T1. When the field effect transistor F1 is turned on and the transistor T1 is turned on, the ignition signal supplied to the thyristor S4 is bypassed from the thyristor.

Between the gate and the source of the field effect transistor F1, the output of the other half cycle of the exciter coil 5 in the direction of the dashed arrow shown in the drawing has a constant time constant through a series circuit of a Zener diode Z4, a resistor R9 and a diode D7. A speed detecting capacitor C5 to be charged is connected in parallel, and a Zener diode Z5 and a series circuit of resistors R and R10 constituting a discharging circuit 11 are connected in parallel to both ends of the capacitor C5.

The thinning control switch 12 comprises a transistor T2. The collector-emitter circuit of the transistor T2 is connected in parallel to the emitter-collector circuit of the transistor T1. When the transistor T2 is turned on, an ignition signal to the misfire control thyristor S4 is transmitted from the thyristor through the transistor T2. It is designed to be bypassed.

A resistor circuit comprising resistors R11 to R12 and a thermistor Rt for temperature compensation is connected between the emitter and base of the transistor T1, and a resistor R13 is connected in parallel between the emitter and collector of the transistor T1.

As shown in FIG. 3, the thinning control pulse generating circuit 8 is driven by a DC voltage obtained from the power supply circuit 6 and alternately repeats a low level state and a high level state at a constant cycle. Timer integrated circuit IC1 for generating a square wave pulse, resistors R14 to R19, and capacitor C
6 and C7, a diode D8, and a transistor T3. By adjusting the resistance values of the resistors R14 and R15, the period and duty of the output pulse of the integrated circuit IC1 can be adjusted. . The rectangular wave output pulse of the timer integrated circuit IC1 is inverted by the transistor T3, and a thinning control pulse Vp is obtained at both ends of the resistor R19. The thinning-out control pulse Vp is a rectangular wave-shaped pulse that alternates between a state in which a high level takes a first level and a state in which a low level takes a second level, at a constant cycle.

The collector of the transistor T3 is the transistor T2 of the misfire control circuit 7 (thinning control switch 12).
The pulse Vp for thinning control obtained at both ends of the resistor R19 is applied to the base of the transistor T2.

Next, the operation of the above embodiment will be described with reference to FIGS.

The AC output Ve (FIG. 4A) generated from the exciter coil 5 in synchronization with the rotation of the internal combustion engine turns to the other half cycle (the lower half of the waveform shown in FIG. 4A) in the direction of the dashed arrow in FIG. The output of the other half cycle causes the speed detecting capacitor C5 to be charged to the polarity shown in the figure through the path of the exciter coil 5, the capacitor C5, the Zener diode Z4, the resistor R9, the diode D7 and the exciter coil 5. The voltage Vc5 at both ends (a negative voltage with respect to the ground) rises, for example, from the rotational angle position θ0 (see FIG. 4B). Voltage Vc5 is the Zener diode Z
5 zener voltage Vz5. When the thyristor S3 of the ignition timing determination circuit 4 conducts at the ignition angle position .theta.i of the engine and the output of the exciter coil 5 is short-circuited, the charge of the speed detecting capacitor C5 is discharged through the discharge circuit 11 at a constant time constant. The voltage Vc5 across the capacitor C5 decreases. When the voltage Vc5 (speed detection voltage) across the capacitor C5 is equal to or less than a set value Vfr determined by the cutoff level of the field effect transistor F1, the field effect transistor F1 is turned on and the transistor T1 is turned on (O
N) and the ignition signal is prevented from being applied to the misfire control thyristor S4. When the speed detection voltage Vc5 exceeds the set value Vfr, the field effect transistor F1 is turned off. As a result, the transistor T1 also becomes non-conductive (OFF). At this time, when the transistor T2 (thinning control switch 12) is non-conductive, the supply of the ignition signal to the misfire control thyristor S4 is permitted. become.

FIG. 4B shows an example of the change of the speed detection voltage Vc5 with respect to the rotation angle θ when the engine speed is lower than the set speed (broken line), and when the engine speed is higher than the set speed. 4C is compared with one example (solid line), and FIG. 4C shows the case where the transistor T1 has an O
The state of N, OFF is shown. When the engine speed is low, the speed detection voltage Vc5 decreases from the angular position θi and reaches the set value Vfr at the angular position θt '. The angular position at which the speed detection voltage Vc5 reaches the set value is delayed with an increase in the rotational speed of the engine. When the engine is running at a high speed, the speed detection voltage Vc5 reaches the set value Vfr at the angular position θt. In this embodiment, the discharge circuit is arranged so that the angular position .theta.t coincides with the angular position (e.g., .theta.1) at which the output of the exciter coil 5 turns into one half cycle when the rotation speed reaches a set value at high engine speed. Eleven resistance values are adjusted.
Therefore, when the rotational speed of the engine exceeds the set value, the ignition signal is given to the misfire control thyristor S4 by the output of one half cycle of the exciter coil 5 when the transistor T1 is non-conductive (OFF). Continue until time. In this state, if the transistor T2 constituting the thinning control switch 12 is non-conductive (OFF), the firing signal Vt is applied to the misfire control thyristor S4 every time one half cycle output is generated in the exciter coil 5. (See FIG. 4D).

The transistor T2 constituting the thinning control switch 12 is controlled by a thinning control pulse Vp (FIG. 5B) output from the thinning control pulse generating circuit 8, and the pulse Vp is at the high level (H). The transistor T2 is in a conductive (ON) state when it takes the level of 1, and the transistor T2 is non-conductive (OFF) in a state where the pulse Vp takes the second low level (L).
State (see FIG. 5C). The transistor T1 and the transistor T2 are connected in parallel, and a firing signal is supplied to the misfire control thyristor S4 only when both the transistors T1 and T2 are simultaneously in a non-conductive (OFF) state. Therefore, in this example, only the ignition signal Vt indicated by the solid line in FIG. 5E is given to the misfire control thyristor S4.
The ignition signal Vt 'indicated by a broken line in FIG. 9 is bypassed through the transistor T2, and is prevented from being applied to the misfire control thyristor S4. When the ignition signal Vt is given to the misfire control thyristor S4, the thyristor S4 conducts and bypasses the charging current of the ignition energy storage condensator C1, so that the charging of the capacitor C1 is prevented and the ignition operation is started. Stop. When the ignition signal Vt is prevented from being applied to the misfire control thyristor S4, the thyristor S4 remains non-conductive, and the ignition operation is performed.

In this example, as shown in FIG. 5 (F) and FIG. 5 (G), the states of the charging voltage Vc1 of the ignition energy storage capacitor C1 and the discharge current i2 of the ignition plug 2 respectively are shown. And two successive misfires are alternately and periodically repeated to perform thinning ignition.
The period in which ignition occurs and the period in which misfire occurs are determined by the resistors R14 and R15 and the capacitor C of the pulse generation circuit 8 for thinning control.
It can be arbitrarily set by adjusting the cycle and duty ratio of the thinning-out control pulse Vp by means of 6, C7.

As described above, when the rotation speed of the internal combustion engine exceeds the set value, the period in which ignition occurs and the period in which misfire occurs are alternately and periodically repeated, whereby the output of the engine is reduced and the engine output is reduced. Can be prevented from becoming excessively high.

In the above embodiment, the thinning-out control pulse generating circuit 8 includes the timer integrated circuit IC1, the transistor T3,
Diode D8, resistors R14 to R19 and capacitor C6 to
The thinning control pulse generation circuit is driven by a DC voltage obtained from the power supply circuit 6 and alternates between a state of taking a first level and a state of taking a second level at a constant period. Any method may be used as long as it generates a rectangular wave-like thinning control pulse that repeats in step (1).

In the above embodiment, if the duty of the thinning control pulse is changed in conjunction with the throttle of the internal combustion engine, an optimum misfire pattern can be obtained for each throttle opening. However, the driving feeling of a vehicle or the like driven by the internal combustion engine can be improved.

That is, when the vehicle or the like driven by the internal combustion engine reaches the maximum speed while increasing its speed, the acceleration state of the vehicle or the like changes depending on the degree of the throttle opening. Naturally, if the throttle opening is large, the maximum speed is reached at a large acceleration, and if the throttle opening is small, the maximum speed is reached at a small acceleration. in this case,
The misfire pattern that results in the best driving feeling and the best vehicle speed continuity may vary with throttle opening. In such a case, when the throttle opening is large, the number of thinned sparks is increased, and when the throttle opening is small, the number of thinned sparks is reduced.
What is necessary is just to change the duty of the thinning control pulse in accordance with the throttle opening.

To change the duty of the thinning control pulse by the throttle opening, for example, in the above-described embodiment, the timer integrated circuit I of the thinning control pulse generating circuit 8 is used.
The resistor R14 connected to C1 may be replaced by a variable resistor (throttle sensor) whose resistance changes in conjunction with the throttle, and the resistance of the resistor R14 may be changed according to the throttle opening. . Throttle opening and resistance R
By appropriately setting the relationship between the fourteen resistance values, it is possible to obtain a misfire pattern that provides optimum driving feeling and vehicle speed stabilization at each throttle opening.

[0034]

As described above, according to the present invention, when the rotational speed of the internal combustion engine exceeds a set value, the misfire control circuit for stopping charging of the ignition energy storage capacitor and stopping the ignition operation, and the exciter A rectangle driven by an output voltage of a power supply circuit that obtains a constant DC voltage by using a part of the output of a coil and alternately repeats a state of taking a first level and a state of taking a second level at a constant cycle. A thinning control pulse generating circuit for generating a wave-like thinning control pulse, wherein when the rotation speed of the internal combustion engine exceeds a set value, the operation of the misfire control circuit is controlled by the thinning control pulse to perform the thinning control. In this case, the ignition operation is permitted during the period when the application pulse takes the first level, the ignition operation is stopped during the period when the thinning control pulse takes the second level, and the engine is thinned and ignited. In addition to preventing the rotation speed from exceeding the set value, it can prevent the output of the engine from fluctuating significantly before and after the set rotation speed, which can prevent impact on vehicles equipped with the engine. is there.

According to the second aspect of the present invention, a DC voltage for driving the thinning-out control pulse generation circuit can be obtained by the power supply circuit utilizing a part of the output of the exciter coil. It has the advantage of not requiring a separate power supply.

According to the third aspect of the present invention, since the means for changing the duty of the thinning control pulse in accordance with the throttle opening is provided in the thinning control pulse generating circuit, each throttle opening of the internal combustion engine is provided. In this case, there is an advantage that a misfire pattern that provides an optimum driving feeling and vehicle speed stabilization can be obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a specific configuration example of an ignition timing determination circuit used in the embodiment of FIG.

FIG. 3 is a circuit diagram showing a specific configuration example of a misfire control circuit and a thinning control pulse generation circuit used in the embodiment of FIG. 1;

FIG. 4 is a waveform diagram showing voltage waveforms of various parts of the misfire control circuit of FIG . 3 and ON / OFF states of switches.

FIG. 5 is a waveform diagram showing a voltage or current waveform of each part in FIGS . 1 and 3 and an on / off state of a switch.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ignition coil, 2 ... Spark plug, 3 ... Ignition main circuit, 4
... ignition timing determination circuit, 5 ... exciter coil, 6 ... power supply circuit, 7 ... misfire control circuit, 8 ... thinning control pulse generation circuit, 9 ... thyristor firing circuit, 10 ... thyristor firing control switch, 11 ... discharge Circuit 12, thinning-out control switch (transistor T2), C1 ... ignition energy storage capacitor, C2 ... power supply capacitor, C5 ... speed detection capacitor, S1 ... discharge control thyristor, S2 ...
Thyristor for charge control, S4 ... Thyristor for misfire control.

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02P 11/02 301 F02P 9/00 304

Claims (3)

(57) [Claims] An ignition coil, an exciter coil provided in an AC generator driven by an internal combustion engine, an ignition energy storage capacitor provided on a primary side of the ignition coil, and an ignition energy storage capacitor An ignition main circuit comprising: a discharge control thyristor provided to discharge an electric charge to a primary coil of an ignition coil; and an ignition timing determination circuit for giving a trigger signal to the thyristor at the ignition timing of an internal combustion engine; A capacitor charging circuit for charging the ignition energy storage capacitor with the output of one half cycle; and stopping the ignition energy storage by stopping charging of the ignition energy storage capacitor when the rotation speed of the internal combustion engine exceeds a set value. An ignition device for an internal combustion engine including a misfire control circuit, wherein a part of the output of the exciter coil is stored. A power supply circuit to obtain a DC voltage across the power supply capacitor power capacitor and the terminal voltage of the power supply capacitor and a constant-voltage circuit to maintain a constant that is driven by a DC voltage obtained from the power supply circuit,
A decimation control pulse generation circuit that generates a rectangular wave decimation control pulse that alternates between a state that takes a first level and a state that takes a second level at a constant cycle, further comprising: a misfire control circuit; A misfire control thyristor connected to the capacitor charging circuit so as to substantially bypass the charging current of the ignition energy storage capacitor from the capacitor when conducting, and an output of one half cycle of the exciter coil A thyristor ignition circuit for providing an ignition signal to the misfire control thyristor, a speed detection capacitor charged with a constant time constant by the output of the other half cycle of the exciter coil, and a charge of the speed detection capacitor And a discharge circuit for discharging the battery with a constant time constant, and connected to a firing circuit of the misfire control thyristor for detecting the speed. Is controlled by a speed detection voltage obtained at both ends of the capacitor, and when the speed detection voltage is equal to or less than a set value, the ignition signal is prevented from being supplied to the misfire control thyristor, and the speed detection voltage exceeds the set value. A thyristor ignition control switch that allows the ignition signal to be given to the misfire control thyristor when connected to the ignition circuit of the misfire control thyristor, and controlled by the thinning control pulse, The ignition signal is prevented from being applied to the misfire control thyristor while the thinning control pulse is at the first level, and the misfire control signal is prevented while the thinning control pulse is at the second level. An ignition device for an internal combustion engine, comprising: a thinning-out control switch that allows a firing signal to be supplied to a thyristor. 2. The power supply capacitor is connected in series with the ignition energy storage capacitor, and the constant voltage circuit bypasses the charging current of the power supply capacitor from the power supply capacitor when the power supply capacitor is turned on. A charge control thyristor, and a circuit that triggers the charge control thyristor when a voltage across the power supply capacitor exceeds a set value, wherein the power supply capacitor and the charge control thyristor are connected to the capacitor charging circuit. The ignition device for an internal combustion engine according to claim 1, wherein the ignition device forms a part of the ignition device. 3. The thinning control pulse generating circuit according to claim 1, further comprising means for changing a duty of the thinning control pulse in accordance with a throttle opening of the internal combustion engine. The ignition device for an internal combustion engine according to any one of the above.